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inserted PNG image misinterpreted as JPEG

Posted by Graham Perrin on Feb 03, 2009; 5:02pm
URL: https://support.nabble.com/inserted-PNG-image-misinterpreted-as-JPEG-tp2264392.html

See for example
<http://n2.nabble.com/file/n2264328/digesting%2BRSS.jpeg
— the result of inserting a PNG
— note the .jpeg suffix to the file name.

This happens only rarely.

I have a sense that it's more likely to happen if the PNG is above some size threshold.

Priority: 5 (lowest).

For reference, I attach (as a file, not an image) the PNG file that was interpreted as JPEG:
digesting+RSS.png

Environment: Safari 3.2.1 (5525.27.1), Mac OS X 10.5.6, Intel; and I typically drag the image from ~/Desktop to the Choose File button (AFAIK the ability to drop there is a feature of Mac OS X).

.png extension is present but not shown in Finder: